Good Riddles

Question: I give advice to others,
yet I know nothing myself.
I am a hitchhiker destined to stay still.

Question: What has a tongue but can not talk. Gets around, but can not walk.

Question: There was three elephants who were about to leave the home. They only had one umbrella. They all try to fit under that on umbrella. When the elephants reach their destination, none of them are the slight least wet. How could this be possible?

Question: Filled with garb,
the price is free.
Just return what you don't need.

What am I?

Question: A semi truck is driving down the highway but the driver isn't paying attention. He goes under an overpass that is too short for his truck by only inches and gets stuck. He thinks it's going to be a very costly mistake but one of his friends happens to pass by and explains to him how he can get out in the matter of minutes without any help.

What does he suggest?